Improvement in



A. DERROM.

Improvement in Applying Plaster to Walls and Ceilings.

No. 122,938. Patentedlara .23,l872.

a mlmm: I Y mm:

UNITED STATES PATENT QFFICE.

ANDREW DERROM, OF PATERSON, NEW JERSEY.

IMPROVEMENT lN APPLYING PLASTER TO WALLS AND CEILINGS.

Specification forming part of Letters Patent No. 122,938, dated January23, 1872.

Specification describing a new and useful Improvement in Covering andOrnamenting iValls, Partitions, Ceilings, 830., invented by ANDREWDERROM, of Paterson, in the county of lassa-ic and State of New Jersey.

The object of this invention is to provide means for utilizing plasterand other similar compositions in a more full and satisfactory mannerforbuilding purposes than heretofore. The invention chiefly consists in theuse and manner of applying molds against the walls or ceilings, topermit the cast-ing of theplaster or other matter to its place. Thisadmits of economical application, and in more or less elaborate orartistic style, bringing the finest productions of genius to thehumblest homes.

The artistic advantage of this method of applying plaster or othercomposition to walls or ceilings is, if possible, still surpassed by theutilitarian benefits arising from its adoption. Building fronts can beprovided with cheap and durable coatings, and wooden structures madelire-proof by having the walls on both sides and also the ceilings linedwith heavy coats of plaster or cement. The old mode of applying suchsubstances, by means of trowels, makes it very costly to use themotherwise than very thin, and to obtain nicely'finished surfaces. VVit-hthe aid of molds the question of greater or less thickness is only oneof cost of material, and the surface-finish is spontaneously obtained bythe very act of application.

In the accompanying drawing, Figure 1 represents a sectional View of awall or partition, showing the manner of using the vertical mold orfalse wall. Fig. 2 is a sectional View of a ceiling, showing the use ofthe hanging ceiling as a mold.

Similar letters of reference indicate corresponding parts.

To cover the surface of a wall, either inside or outside, I use avertical mold or false wall, A, which is placed at the requisitedistance from the surface to be coated. The plaster or removed, be anexact impression of the mold.

The finest wood graining, as well as moldings, carvings, 850., of mostdiflicult make can thus be cheaply multiplied. Thus the inner or outersides of walls can be covered in sections of greater or less extentuntil perfected.

On ceilings I propose to use a pendent ceiling, B, which is supported orsuspended a suitble distance under the beams or laths, according to thethickness of the plaster to be obtained. The surface of the pendentceiling may be ornamented in suitable manner or quite plain.

The plaster is, from above, poured upon the pendent ceiling. It willadhere to the beams and laths, while the surface of Bthe same as in thefirst case, that of A--is' so prepared by the application of glycerineor other known material, that the plaster cannot adhere to it. Theplaster may, on such ceilings, be so thickly applied as to coat theflooring-beams, and

thus make the floors fire-proof.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The false wall or mold A, used in the applicationof plaster or other composition to walls or partitions, as set forth.

2. The pendent ceiling B, used in the application of plaster or othercomposition to ceilings, as set forth.

3. The method, herein described, of applying plaster to walls orceilings by the aid of movable molds.

ANDREW DERROM. Witnesses:

A. V. BRIESEN, JAMES VAN BLARCOM.

